Design and Implementation of CCTV Security System Based on SSL/ VPN Tunnelling Technique/ [Ryu, Su-Bong;Lee, Nam-Ki;Kang, Min-Sup;] / Journal of Security Engineering
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All-IP User Authentication and Authorization Mechanism by OTP in the SSL-VPN System/ [Byun, Byung-Kil;Lee, Ki-Young;] / The Journal of Korean Institute of Information Technology